Path: utzoo!attcan!uunet!cs.utexas.edu!ginosko!samsung!aplcen!haven!decuac!shlump.nac.dec.com!shodha.dec.com!alan
From: alan@shodha.dec.com ( Alan's Home for Wayward Notes File.)
Newsgroups: comp.sys.dec
Subject: Re: Tape Drive tricks on VMS & Ultrix
Summary: It works for me.  Ask the CSC if it's supported.
Message-ID: <465@shodha.dec.com>
Date: 28 Oct 89 07:29:15 GMT
References: <12329.25472184@vaxb.acs.unt.edu>
Organization: Digital Equipment Corp. - Colorado Springs, CO.
Lines: 43

In article <12329.25472184@vaxb.acs.unt.edu>, billy@vaxb.acs.unt.edu writes:
> Hi,
> 
> I am planning some upgrades and wonder if the following will work:
> 
>     VAX 6310  DECsystem 5810
>        |        /             
>     HSC 50     /
>        \      /
>         \    /
>          \  /
>          TA78 tape drive

	You forgot to include an HSC for Ultrix side of the picture.
	Having VMS and Ultrix on the same star coupler isn't a
	supported configuration.  See the V3.0 and V3.1 release
	notes for details.  The picture should look like:

      VAX 6310  DECsystem 5810
         |        /             
      HSC 50    HSCxx
         \      /
          \    /
           \  /
           TA78 tape drive

	I use this configuration and it works.  My Ultrix systems
	have their own HSC and star coupler.  We generally only
	have one port of the drive selected at a time depending
	on whether we want to access it from VMS or Ultrix.  You'll
	have to check with Field Service or the CSC to find out
	is this configuration is supported.  Offhand I don't know
	why it wouldn't be.

	If the recently announced KDM70 were supported on the
	DECsystem you wouldn't need the HSC.  I can't comment
	on whether a future version of Ultrix will support it.

> Billy Barron                  Bitnet : BILLY@UNTVAX


-- 
Alan Rollow				alan@nabeth.enet.dec.com